I cannot quit this curious subject of the difficulty arising from population, a subject that appears to me to deserve a minute investigation and able discussion much beyond my power to give it, without taking notice of an extraordinary passage in Dr Price's two volumes of Observations. Having given some tables on the probabilities of life, in towns and in the country, he says (Vol. II, p. 243): From this comparison, it appears with how much truth great cities have been called the graves of mankind. It must also convince all who consider it, that according to the observation, at the end of the fourth essay, in the former volume, it is by no means strictly proper to consider our diseases as the original intention of nature. They are, without doubt, in general our own creation. Were there a country where the inhabitants led lives entirely natural and virtuous, few of them would die without measuring out the whole period of present existence allotted to them; pain and distemper would be unknown among them, and death would come upon them like a sleep, in consequence of no other cause than gradual and unavoidable decay. I own that I felt myself obliged to draw a very opposite conclusion from the facts advanced in Dr Price's two volumes. I had for some time been aware that population and food increased in different ratios, and a vague opinion had been floating in my mind that they could only be kept equal by some species of misery or vice, but the perusal of Dr Price's two volumes of Observations, after that opinion had been conceived, raised it at once to conviction. With so many facts in his view to prove the extraordinary rapidity with which population increases when unchecked, and with such a body of evidence before him to elucidate even the manner by which the general laws of nature repress a redundant population, it is perfectly inconceivable to me how he could write the passage that I have quoted. He was a strenuous advocate for early marriages, as the best preservative against vicious manners. He had no fanciful conceptions about the extinction of the passion between the sexes, like Mr Godwin, nor did he ever think of eluding the difficulty in the ways hinted at by Mr Condorcet. He frequently talks of giving the prolifick powers of nature room to exert themselves. Yet with these ideas, that his understanding could escape from the obvious and necessary inference that an unchecked population would increase, beyond comparison, faster than the earth, by the best directed exertions of man, could produce food for its support, appears to me as astonishing as if he had resisted the conclusion of one of the plainest propositions of Euclid.